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    <title>Document</title>
    <script src="./OL_SDK/include-openlayers-local.js"></script>
    <script src="./libs/gaode.js"></script>
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<body>
    <div id="map">
    </div>
    <script>
        var map = new ol.Map({
            target: "map",
            layers: [gaode],
            view: new ol.View({
                projection: 'EPSG:4326',
                center: [114.30, 30.50],
                zoom: 4
            })
        })
        /* 创建画布 */
        const source = new ol.source.Vector({})
        const layer = new ol.layer.Vector({
            source
        })
        map.addLayer(layer);
        /* 创建画笔 */
        let draw = new ol.interaction.Draw({
            type: "LineString",
            source
        })
        draw.on("drawend", evt => {
            var position = evt.feature.getGeometry().getCoordinates();
            console.log(position)
        })
        /* 添加画笔到地图容器 */
        map.addInteraction(draw);
    </script>
</body>

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